THE IDOLM@STER RADIO Utahime Rakuen, part of THE IDOLM@STER RADIO series, was released on September 27, 2006 at the price of ￥3,000 by Columbia Music Entertainment. Though they are unlisted on the Artist Listing, the official website clarifies that Naomi Wakabayashi, Mayako Nigo and Eriko Nakamura make appearances on this as guest speakers.